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A. HALLOWELL. STEAM 000K.

No. 65,075. V Patented May 28, 1867.

ginitnh grains igstent @ffita ALBER" HALLOWELL, OF LOWELL, MASSACHUSETTS, ASSIGNOR TO HILL SELF AND HORACE R. BARKER, OF THE SAME PLACE.

Letters Patent No. 65,075, dated lkfay 28, 1867.

IMPROVEMENT IN STEAM-COCKS.

TO ALL PERSONS TO WHOM THESE PRESENTS SHALL COME:

Be it known that I, ALBERT HALLOWELL, of-Lowell, in the county of Middlesex, and State of Massachusot-ts, have invented a new and useful Improvement in'Steam-Cocks; and do hereby declare the same to be fully described in the following specification, and represented in the accompanying drawing, which exhibits a vertical section of a steam-cock as provided with my invention.

In the operation of the steam-cock, for which Letters Patent, No. 51,177, were granted November 28, 1865, to myself and Horace R. Barker, 21. difliculty has been experienced which it is the purpose of present improvement to obviate. It has been found that, owing to the expansion of the screw-cap, a contraction of the key caused by suddenvariations of temperature, the valve of the key will be drawn so closely against its seat as to prevent the key from being revolved without great difiiculty or danger of breakage of the connection between the key and the hand-wheel.

To prevent this difiiculty, I apply to the key and in a chamber formed in the cap a helical spring to press against the bottom of such chamber, and-against the hub of the hand-wheel. This spring when the cap may expand, or the key be suddenly contracted lengthwise, will allow the hand-wheel to move or be moved downward relatively to the cap, or the latter to move upward relatively to the hand-wheel, or, in otherwords, will permit the expansion of the cap, or contraction of the key, to takeplace from the cause, as stated, without causing the'conical valve of the key to be'jammed into its seat, so as to preverit the valve from boin feasily revolved by the hand-wheel.

In the drawing, which shows a somewhat different arrangement of the valve operating key, and its screws, from that exhibited in the said patent, A denotes the valve; B, its seat; 6, the valve-stem; d and c the valveoperating screws; F, the screw-cap; I, the hand-wheel; G, the body; E, the key. The conical valve of the key E, as well as the seat f of such valve, I have arranged between the screws d e and the hand-wheel, instead of at the lower part of the key, as represented and claimed in the aforesaid patent, and I have made the key with a polygonal extension, I, to extend into a corresponding cavity, m, formed in the valve-stem b. I also make a chamber, 72, in the upper part of the cap F, to receive the helical springs, which envelope the key E, rests on the bottom of the said chamber, and extends into a chamber, P, formed in the hub H of the hand-wheel I. The upper part of the cap F also enters the chamber P, and the hub rests directly on the spring By laying hold of the hand-wheel and revolving it, the key will be revolved, and will turn the valve-stern so asv to cause the valve A to be put in motion byits screws, and either toward or away from its seatB, as occasion may require. -The valve e with its seatf prevents theescape of steam through the cap F. By the new arrangement of the valve f andlits seat 0 they are protected by" the valve-stem b and the cap F from foreign matters or depositsfrom the steam in the body G, to which they are exposed when arranged as exhibited in the aforesaid patent. In my present arrangement, the valve e and its seat are completely insulated from the steam while within the body of the cock, and thus no foreign matter can be deposited on the valve or get between it and its seat in order to injuriousl'y affect their operation.

I am aware that it is not new to make a chamber in' the upper part of the'screw-cap F, and to put into such chamber wooden annuli, and against opposite sides of an annular projection extending from the valve key, the said wooden annuli and the key being kept in their normal positions, with respect to the screw-cap, by an additional screw-cap screwed on the latter, such being as represented in the United States Patent No. 48,452. I do not claim such, as the wooden annuli when swelled by the steam and sudden increase of temperature operate to preventthe key from being easily revolved. Nor do I claim the arrangement of the valve-key, valve-stem, and lifting-screws, as set forth in suchPatent No. 48,452.

What I claim as my invention is as follows:

I claim the combination as well as the arrangement of the spring 8, or the same and either or both the chambers n P, with the auxiliary conical valve e and seatf, the cap F, the hand-wheel I, and the keyE employed for fe ting, by the aid of the screws ed, the vertical movements of the main valve A with respect to its seat B, as described.

ALBERT HALLOWELL.

Witnesses:

R. -H. Ennr, Gso. H. Annnnws. 

